EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 396/ 2 Article

Free access article

Issue A&A
Volume 396, Number 2, December III 2002
Page(s) L21 - L24
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021612



A&A 396, L21-L24 (2002)
DOI: 10.1051/0004-6361:20021612

Letter

Absorption systems in the spectrum of GRB 021004

P. Møller1, J. P. U. Fynbo2, 3, J. Hjorth3, B. Thomsen2, M. P. Egholm4, 2, M. I. Andersen5, J. Gorosabel6, 7, S. T. Holland8, P. Jakobsson3, B. L. Jensen3, H. Pedersen3, K. Pedersen3 and M. Weidinger2

1  European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748, Garching bei München, Germany
2  Department of Physics and Astronomy, Århus University, Ny Munkegade, 8000 Århus C, Denmark
3  Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
4  Nordic Optical Telescope, Apartado Postal 474, 38700 Santa Cruz de La Palma, Canary Islands, Spain
5  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
6  Instituto de Astrofísica de Andalucía (IAA-CSIC), PO Box 03004, 18080 Granada, Spain
7  Laboratorio de Astrofísica Espacial y Física Fundamental, PO Box 50727, 28080 Madrid, Spain
8  Department of Physics, University of Notre Dame, Notre Dame, IN 46556-5670, USA

(Received 18 October 2002 / Accepted 31 October 2002)

Abstract
We report on a 3600 s spectrum of GRB 021004 obtained with the Nordic Optical Telecope on La Palma 10.71 hours after the burst. We identify absorption lines from five systems at redshifts 1.3806, 1.6039, 2.2983, 2.3230, and 2.3292. In addition we find an emission line which, if due to Ly $\alpha$ from the host galaxy, gives a redshift of 2.3351. The nearest absorber is blueshifted by 530 km s -1 with respect to this line, consistent with shifts seen in Damped Ly $\alpha$ and Lyman-Break galaxies at similar redshifts. The emission line flux is $2.46\pm0.50 \times 10^{-16}$ erg s -1 cm -2. Some of the absorption systems are "line-locked", an effect often seen in QSO absorption systems believed to originate close to the QSO central engine.


Key words: cosmology: observations -- gamma rays: bursts -- quasars: absorption lines

Offprint request: P. Møller, pmoller@eso.org

SIMBAD Objects



© ESO 2002

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.